1. Bellows or diaphragm air conditioner thermostat
1. Fault phenomenon: poor contact or burning, resulting in the circuit can not be connected; The frequent action of the contact arc and sticking causes the circuit to be unbreakable; The thermostat in the temperature sensing chamber leaks, causing the contact to fail to operate and lose control.
Maintenance method: After turning the knob of the air conditioner thermostat in the forward and reverse directions several times, use the multimeter R×l file to measure the two terminals of the temperature controller in the connected state, if the resistance value is very small, indicating that the contact is normal; If the resistance is very large, it means that the contact contact is poor; If it doesn't, it may be a leak of the thermostat.
Whether there is leakage can be first visually inspected, observe whether the sealing welding head of the temperature sensing head is broken, whether the temperature sensing package is damaged and cracked, whether there are bending marks of the temperature sensing tube, etc., and then put the temperature sensing package in warm water of 30-40-C to test whether the contact is closed, if the contact is still not closed. indicates that the thermostat in the temperature sensor package has been leaked; If the contact can be closed, then take out the temperature sensing bag from the water, and the contact is disconnected after being placed in a low temperature environment for a period of time, indicating that the temperature adjustment range of the thermostat is improper, which can be corrected by adjusting the temperature range of the adjusting screw, turn L in the counterclockwise direction, and try again after 2 hiding.
2. Fault phenomenon: after the contact of the air conditioner thermostat is adhered due to ignition. The contacts cannot jump open automatically, and the compressor cannot be stopped.
Maintenance method: Put the temperature sensor bag in the refrigerator (5-lO°C) of the double-door refrigerator, and measure whether the two-wire terminals of the temperature controller are disconnected. If you don't keep opening. Indicates that the contact is adhesive, and the contact can be mechanically forced to break with a flat screwdriver; If the contact can be jumped open, the temperature control range of the thermostat drifts and is low, and the temperature control range adjustment screw can be adjusted clockwise.
3. Fault phenomenon: leakage of thermostat
Maintenance method: Use a hot towel to heat the temperature sensing tube, adjust the knob to the lowest temperature, and use a multimeter to measure whether the switch of the thermostat is turned on. If the switch doesn't work. This indicates that the thermostat has leaked, and the thermostat should be replaced with a new one.
2. Thermostat for hot and cold air conditioners
The thermostat used in electric air conditioners has two sets of contact mechanisms (cold contacts and hot contacts) in the contact control box, and the same temperature sensing bellows is used to control the heat and cold. Its fault phenomenon and inspection method are basically the same as those of ordinary thermostats, but it should be noted that it should also be checked whether the cold and hot switching actions are sensitive, that is, the compressor circuit should be connected when the refrigeration position is connected, and the electric heater circuit should be connected when the heating position is made.
3. Defrost air conditioner thermostat
The defrost temperature controller is an element installed in the control circuit of a thermal air conditioner specifically for switching the solenoid reversing valve.
Its thermostat is placed on the coil of the heat exchanger on the outdoor side. When heating in winter, the frost layer of the outdoor side heat exchanger thickens so that the temperature is lower than a certain set value. Contact action of the defrost controller.
Disconnect the solenoid directional valve. The original heating cycle is changed to a cooling cycle. There are two commonly used structural forms: one is the thermal bimetal sheet type: the other is the ordinary thermostat.
The method of detection is to place the temperature sensing part in water or air at the corresponding temperature. Use a multimeter to measure whether the two terminals are disconnected or on. You can know the good and the bad. Thermal bimetal thermostats are also used for indoor side cold air control.
Fourth, temperature sensing resistance
Electronic air-conditioning thermostats or microcomputer-controlled air-conditioners use thermistors as the temperature sensing element.
A thermistor is a component whose resistance changes significantly with temperature. Thermistor for ten vertical measurement of return air temperature of air conditioner. It generally has a negative temperature coefficient characteristic: the resistance value decreases with increasing temperature.
Specific to the thermistor used in a certain brand of abyss device, its resistance value changes with temperature is generally drawn into a chart in the random manual for testing, and the detection can be in a certain environment. Measurements are made with semiconductor thermometers and multimeters.
When the thermistor is aging and the performance drifts, that is, the correspondence between temperature and resistance value changes, a new thermistor sensor should be replaced.
Failures can occur when the system is not working properly or after a long period of aging. In the maintenance process, sometimes the replacement method is adopted, that is, a good thermostat of the same model and specification is replaced, which not only saves maintenance time, but also can easily identify the quality of the original thermostat.
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